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<span class="token font-matter yaml language-yaml"><span class="token key atrule">title</span><span class="token punctuation">:</span> Blogging Like a Hacker
<span class="token key atrule">lang</span><span class="token punctuation">:</span> en<span class="token punctuation">-</span>US</span>
<span class="token punctuation">---</span></span>
</code></pre></div><p>在这些三条虚线之间，你可以设置预定义变量（参见<a href="#%E9%A2%84%E5%AE%9A%E4%B9%89%E5%8F%98%E9%87%8F">下面</a>），甚至可以创建自己的自定义变量。 然后，您可以使用 <code><a href="/guide/global-computed.html#frontmatter">$frontmatter</a></code> 在页面的其余部分、以及所有的自定义和主题组件访问这些变量。</p> <div class="custom-block tip"><p class="custom-block-title">TIP</p> <p>在 VuePress 中，Front matter 是 <strong>可选的</strong>。</p></div> <h2 id="其他格式的-front-matter"><a href="#其他格式的-front-matter" class="header-anchor">#</a> 其他格式的 Front Matter</h2> <p>除了 YAML 之外，VuePress 也支持 JSON 或者 <a href="https://github.com/toml-lang/toml" target="_blank" rel="noopener noreferrer">TOML<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 格式的 front matter。</p> <p>JSON front matter 需要以花括号开头和结尾：</p> <div class="language- extra-class"><pre class="language-text"><code>---
{
  &quot;title&quot;: &quot;Blogging Like a Hacker&quot;,
  &quot;lang&quot;: &quot;en-US&quot;
}
---
</code></pre></div><p>TOML front matter 需要显式地标注为 TOML：</p> <div class="language- extra-class"><pre class="language-text"><code>---toml
title = &quot;Blogging Like a Hacker&quot;
lang = &quot;en-US&quot;
---
</code></pre></div><h2 id="预定义变量"><a href="#预定义变量" class="header-anchor">#</a> 预定义变量</h2> <h3 id="title"><a href="#title" class="header-anchor">#</a> title</h3> <ul><li>类型: <code>string</code></li> <li>默认值: <code>h1_title || siteConfig.title</code></li></ul> <p>当前页面的标题。</p> <h3 id="lang"><a href="#lang" class="header-anchor">#</a> lang</h3> <ul><li>类型: <code>string</code></li> <li>默认值: <code>en-US</code></li></ul> <p>当前页面的语言。</p> <h3 id="description"><a href="#description" class="header-anchor">#</a> description</h3> <ul><li>类型: <code>string</code></li> <li>默认值: <code>siteConfig.description</code></li></ul> <p>当前页面的描述。</p> <h3 id="layout"><a href="#layout" class="header-anchor">#</a> layout</h3> <ul><li>类型: <code>string</code></li> <li>默认值: <code>Layout</code></li></ul> <p>设置当前页面的布局组件。</p> <h3 id="permalink"><a href="#permalink" class="header-anchor">#</a> permalink</h3> <ul><li>类型: <code>string</code></li> <li>默认值: <code>siteConfig.permalink</code></li></ul> <p>参考: <a href="/guide/permalinks.html">Permalinks</a>.</p> <h3 id="metatitle"><a href="#metatitle" class="header-anchor">#</a> metaTitle</h3> <ul><li>类型: <code>string</code></li> <li>默认值: <code>`${page.title} | ${siteConfig.title}`</code></li></ul> <p>重写默认的 meta title。</p> <h3 id="meta"><a href="#meta" class="header-anchor">#</a> meta</h3> <ul><li>类型: <code>array</code></li> <li>默认值: <code>undefined</code></li></ul> <p>指定额外的要注入的 meta 标签：</p> <div class="language-yaml extra-class"><pre class="language-yaml"><code><span class="token punctuation">---</span>
<span class="token key atrule">meta</span><span class="token punctuation">:</span>
  <span class="token punctuation">-</span> <span class="token key atrule">name</span><span class="token punctuation">:</span> description
    <span class="token key atrule">content</span><span class="token punctuation">:</span> hello
  <span class="token punctuation">-</span> <span class="token key atrule">name</span><span class="token punctuation">:</span> keywords
    <span class="token key atrule">content</span><span class="token punctuation">:</span> super duper SEO
<span class="token punctuation">---</span>
</code></pre></div><h2 id="默认主题的预定义变量"><a href="#默认主题的预定义变量" class="header-anchor">#</a> 默认主题的预定义变量</h2> <h3 id="navbar"><a href="#navbar" class="header-anchor">#</a> navbar</h3> <ul><li>类型: <code>boolean</code></li> <li>默认值: <code>undefined</code></li></ul> <p>参考: <a href="/theme/default-theme-config.html#禁用导航栏">默认主题配置 &gt; 禁用导航栏</a>。</p> <h3 id="sidebar"><a href="#sidebar" class="header-anchor">#</a> sidebar</h3> <ul><li>类型: <code>boolean|'auto'</code></li> <li>默认值: <code>undefined</code></li></ul> <p>参考: <a href="/theme/default-theme-config.html#侧边栏">默认主题配置 &gt; 侧边栏</a>。</p> <h3 id="prev"><a href="#prev" class="header-anchor">#</a> prev</h3> <ul><li>类型: <code>boolean|string</code></li> <li>默认值: <code>undefined</code></li></ul> <p>参考: <a href="/theme/default-theme-config.html#上-下一篇链接">默认主题配置 &gt; 上 / 下一篇链接</a>。</p> <h3 id="next"><a href="#next" class="header-anchor">#</a> next</h3> <ul><li>类型: <code>boolean|string</code></li> <li>默认值: <code>undefined</code></li></ul> <p>参考: <a href="/theme/default-theme-config.html#上-下一篇链接">默认主题配置 &gt; 上 / 下一篇链接</a>。</p> <h3 id="search"><a href="#search" class="header-anchor">#</a> search</h3> <ul><li>类型: <code>boolean</code></li> <li>默认值: <code>undefined</code></li></ul> <p>参考: <a href="/theme/default-theme-config.html#内置搜索">默认主题配置 &gt; 内置搜索</a>。</p> <h3 id="tags"><a href="#tags" class="header-anchor">#</a> tags</h3> <ul><li>类型: <code>array</code></li> <li>默认值: <code>undefined</code></li></ul> <p>参考: <a href="/theme/default-theme-config.html#内置搜索">默认主题配置 &gt; 内置搜索</a>。</p></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/vuejs/vuepress/edit/master/packages/docs/docs/guide/frontmatter.md" target="_blank" rel="noopener noreferrer">在 GitHub 上编辑此页</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2021/1/23 下午1:08:04</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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